Which one of the following sets of quantum numbers represents the highest energy level in an atom?
n = 4; l = 0; m = 0; s = +
n = 3; l = 1; m = 1; s = +
n = 3; l = 2; m = -2; s = +
n = 3; l = 0; m = 0; s = +
For the homogeneous reaction,
4NH3 + 5O2 4NO + 6H2O
the equilibrium constant Kc has the units
conc.+10
conc.+1
conc.-1
it is dimensionless
The correct order of decreasing first ionisation energy is
C > B > Be > Li
C > Be > B > Li
B > C > Be > Li
Be > Li > B > C
Consider the following reaction,
C6H5NO2 X Y + HCl
What is Y?
Acetanilide
Benzinilide
Azobenzene
Hydrazobenzene
Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?
Ag+
Cu2+
Cd2+
Pb2+
Argol, a brown crust, formed during the fermentation of grape juice contains
CO2
fused oil
potassium hydrogen tartarate
lye
Which buffer solution comprising of the following has its pH value greater than 7?
CH3COOH + CH3COONa
HCOOH + HCOOK
CH3COONH4
NH4OH + NH4Cl
Which of the following has sp2-hybridisation?
C2H6
C2H4
BeCl2
C2H2
B.
C2H4
When there are 3 bonds, the hybridisation is sp2. The structures of the given compounds are
a. C2H2 -
b. C2H4 -
c. BeCl2 -
d. C2H2 -